What is the correct sequence of tertiary colours when moving from yellow toward blue?

Correct answer: Yellow then yellow-green then green then blue-green then blue

The governing concept is continuous movement through adjacent colour-wheel hues. Starting at yellow and moving toward blue, the path proceeds through yellow-green, then green, then blue-green, and finally reaches blue. Thus, option A is correct. Yellow-orange and orange move toward red instead, while red-violet, violet, and blue-violet lie on another side of the wheel and do not form the direct yellow-to-blue transition.